Electric cut-out.



T. E. MURRAY. ELEGTRIU OUT-OUT. APPLICATION FILED APRJ, 1910.

m u m m 1 f 7 L a J v m a H w. R. Z22 "a my. Ll-

1 I I l I e A win mama o STATES ZATENT OFFICE.

*irnomas E. MURRAY; or NEW YORK, N. Y.

ELECTRIC cur-our.

' ToaZl wkom it-mg 1 Be it known that I, THOMAS E. MURRAY,

a citiaenof the United States, residing at New York, in the county ofNew York and v State of New York, have invented certain .new and usefulImprovements in Electric Cut-Outs, of which the following is aspecification.

-In- U. S. Letters Patent No. 905,905,

granted to me December 8, 1908, I have described an electric cut-out andholder, in which I have set fortha fuse case in arched form, having itsends constructed to enter recesses in the holder and containing anarched fuse extending between said ends, the space around the fuse andwithin the case being filled with suitable inert refractory I'naterialin'p'ulverized form. In said Letters Patent I have described the fusecase as made wholly of porcelain, or other refractory fictile i'nsulatinmaterial, and I have found suchmateria excellently adapted for theglvlfipwe under all ordinary conditions. en, however, the fuse .is to besubjected to abnormally heavy currents, it is desirable to construct thecase so as to withstand the disruptive effect incident in suchcircumstances to the blowing of the fuse, and also to surround the fusestrip at the blowing point with a body of solid refractory materialdesigned to resist the immediate shock. My invention, therefore,consists in the construction of a cut-out in which I include both thefuse case and the fuse therein, as more particularly recited in theclaims.

In the accompanying drawings Figure 1 a section on the hue a: m of Fig.2. Fig. 2 is a section on the line '1 y of Fig. 1, the

cover and pulverized filling being removed.

Fi 3 is -a section on the hue z z of Fig. 1,

' --an Fig. 4 is a section on the line w w of of refractorg Fig, 1.

blmilar numbers of reference indicate like parts.

, minals, and extends upwardly throu h openings 7, 8, in the base, andhas an arc ed portionabove said base extendin through an o ening 8'in astandard 9. T e portion 10 of the fuse strip which is within the open-Specification of Letters Patent.

Patented June 14, 1910.

application filed April 1, 1910. Serial No. 552,759.

ing is reduced in area so that the blowing of the fuse will occur withinsaid opening, and the incident shock will therefore, in some measure,first come upon the solid body of the standard 9, before it is whollytransmitted to the refractory ulverized material 11 in which the fuse anstandard are embedded.' The standard 9 and projections 2 and 3 arepreferably made integrally with the base, so that the whole forms asolid block of porcelain in which is provided the usual openin 12 forreceiving the supporting bar giumbered 21 in my aforesaid patent), bymeans of which bar and suitable locking mechanism thecut-out, asdescribed in said patent, is secured in place in the holder. The endedges of the base 1 are curved so that a semi-cylindrical cover 13 mayfit over them. The sides of said cover rest against the fiatlongitudinal edges of said base. The cover 13 is to be made of metal,preferably steel, and may be stamped or drop forged from a single piece,or constructed'in any other known way which will insure the maximumstrength with proper lightness of weight. Said cover is secured in placeby means of bolts 14, 15, passing through its sides and through the bodyof the base. If desired the cover may be provided internally with alining of fiber or asbestos felting 16. In order to introduce thepulverized refractory material which forms the filling into the spaceincluded between the cover and the base, I provide recesses 17 in theends of the base, through which, after the cover is in place, saidfilling may be inserted. These recesses are afterward filled withplaster, or like material, as shown at 18.

In operation, when the fuse is blown by reason of an abnormally heavycurrent, the shock comes upon the strong steel cover which cannot bedisrupted thereby, nor can said cover be lifted off of the base becauseof its fastening bolts 14, 15.

I claim Y 1. The combination of a base of fictile refractory material,a' standard of like material thereon, a fuse having a portion of reducedcross sectional area disposed in an opening in said standard and securedat its ends in said base, and a cover secured on said base and inclosingsaid base and standard.

2. The combination of a base of fictile refractory material, a standardof like mate- 'rial thereon, an arched fuse extending side of saithrough an opening in said standard and se cured at its ends in saidbase, a cover of metal secured on said base and inclosin said fuse andstandard, and a.filling of pu verized refractory material within saidcover.

3. The combination of a base of fictile refractory material, a standardof like material on one side thereof and integral therewith, integralprojections on the op osite base, contact plates onlsai projections, afuse connected at its ends to said projections and extending through an0 en ing in said standard, a cover of meta secured on said base andinclosing said fuse cured at its ends in said base, a semi-cy- 1lindrical cover formed inte rally of metal receiving said base and incosin said fuse and standard, and a filling of pu verized refractorymaterial within said cover.

In testimony whereof I have aflixed my signature in presence oftwowitnesses.

THOMAS E. MURRAY. lVitnesses:

GERTRUDE T. Pomona, MAY T. MOGARRY.

